85. A machine system configured for performing prespecified operations wherein at least a portion of the machine system includes a data processing machine configured to perform at least part of the prespecified operations of the machine system, the machine system comprising: a user monitoring subsystem configured to automatically repeatedly monitor at least one of machine usage activities of, states of and surroundings of a corresponding first user of the machine system and to automatically repeatedly record report records corresponding to the monitored activities, states and/or surroundings of the first user, wherein the automatically repeated monitorings are carried out transparently by the user monitoring subsystem without need for diverting focused attention of the first user to aiding the monitorings; and an invitations presenting subsystem configured to automatically present to the first user, immediately acceptable invitations to join in on system-identified telecommunications-mediated information exchange forums that are each a forum having at least one other user co-invited to it or already participating in the forum, where the invitations are based on automatically repeated determinations by the machine system of likely recent focusings of attention or likely recent co-compatibilities of the first user to join in on said forums and where the automatically repeated determinations are based on at least some of the recorded report records corresponding to the monitored activities, states and/or surroundings of the first user, wherein said likely recent focusings of attention of the first user or said likely recent co-compatibilities 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 a determined time duration prior to said presentation to the first user of the respective invitations, the determined time duration being determined based on a currently active profile characterizing the first user.
85. A machine system configured for performing prespecified operations wherein at least a portion of the machine system includes a data processing machine configured to perform at least part of the prespecified operations of the machine system, the machine system comprising: a user monitoring subsystem configured to automatically repeatedly monitor at least one of machine usage activities of, states of and surroundings of a corresponding first user of the machine system and to automatically repeatedly record report records corresponding to the monitored activities, states and/or surroundings of the first user, wherein the automatically repeated monitorings are carried out transparently by the user monitoring subsystem without need for diverting focused attention of the first user to aiding the monitorings; and an invitations presenting subsystem configured to automatically present to the first user, immediately acceptable invitations to join in on system-identified telecommunications-mediated information exchange forums that are each a forum having at least one other user co-invited to it or already participating in the forum, where the invitations are based on automatically repeated determinations by the machine system of likely recent focusings of attention or likely recent co-compatibilities of the first user to join in on said forums and where the automatically repeated determinations are based on at least some of the recorded report records corresponding to the monitored activities, states and/or surroundings of the first user, wherein said likely recent focusings of attention of the first user or said likely recent co-compatibilities 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 a determined time duration prior to said presentation to the first user of the respective invitations, the determined time duration being determined based on a currently active profile characterizing the first user. 98. The machine system of claim 85 wherein the likely recent focusings of attention of the first user can include focusings of attention on differently sourced items of content that respectively originated from different sources of content.