77. A non-abstract machine system that includes a user-accessible presentation device and is structured to repeatedly automatically cause a flow through the user-accessible presentation device of a stream of presentable and with each of the automatic repeats, more up to date invitations and/or suggestions that have been automatically repeatedly generated in response to automatically repeated detections of recent attention focusing activities of a first user of the machine system on content presented and thus available to the first user, the automatically repeated detections of recent attention focusing activities being ones that are transparently detected by background operations of the machine system without need for diverted focusing of attention by the first user directed to aiding the background detecting of the automatically repeatedly detected recent attention focusing activities of the user, where the respective invitations and/or suggestions, if presented, are directly convertible by the first user into respective ones of immediately joined-with forums and/or immediately followed upon suggestions, each of the forums being one that has at least one other user co-invited to it or already participating in the forum, the machine system including: a presentation format controller that is configured to determine or control at least one of: whether or not a given, flowed-through invitation or suggestion is at all presented to the first user; when a given, flowed-through invitation or suggestion is presented to the first user; what order of presentation is used for multiple ones of presented invitations and/or suggestions of the caused flow; at what rate multiple ones of presented invitations and/or suggestions are automatically presented to the first user; and in what format a given one or more of presented ones of the invitations and/or suggestions are automatically presented to the first user; wherein at least a portion of the machine system includes a data processing machine; and wherein said recent attention focusing activities of the first user occurred no more than at least one of: 3 hours prior to said presentation to the first user of the respective invitations and/or suggestions, if presented; and a determined time duration prior to said presentation to the first user of the respective invitations and/or suggestions, if presented, the determined time duration being determined based on a currently active profile characterizing the first user.
77. A non-abstract machine system that includes a user-accessible presentation device and is structured to repeatedly automatically cause a flow through the user-accessible presentation device of a stream of presentable and with each of the automatic repeats, more up to date invitations and/or suggestions that have been automatically repeatedly generated in response to automatically repeated detections of recent attention focusing activities of a first user of the machine system on content presented and thus available to the first user, the automatically repeated detections of recent attention focusing activities being ones that are transparently detected by background operations of the machine system without need for diverted focusing of attention by the first user directed to aiding the background detecting of the automatically repeatedly detected recent attention focusing activities of the user, where the respective invitations and/or suggestions, if presented, are directly convertible by the first user into respective ones of immediately joined-with forums and/or immediately followed upon suggestions, each of the forums being one that has at least one other user co-invited to it or already participating in the forum, the machine system including: a presentation format controller that is configured to determine or control at least one of: whether or not a given, flowed-through invitation or suggestion is at all presented to the first user; when a given, flowed-through invitation or suggestion is presented to the first user; what order of presentation is used for multiple ones of presented invitations and/or suggestions of the caused flow; at what rate multiple ones of presented invitations and/or suggestions are automatically presented to the first user; and in what format a given one or more of presented ones of the invitations and/or suggestions are automatically presented to the first user; wherein at least a portion of the machine system includes a data processing machine; and wherein said recent attention focusing activities of the first user occurred no more than at least one of: 3 hours prior to said presentation to the first user of the respective invitations and/or suggestions, if presented; and a determined time duration prior to said presentation to the first user of the respective invitations and/or suggestions, if presented, the determined time duration being determined based on a currently active profile characterizing the first user. 97. The machine system of claim 77 wherein the content that is presented and thus available to the first user, and upon which the first user's recent attention focusing activities are automatically repeatedly detected, can include differently sourced items of content that respectively originated from different sources of content.