3. The method of claim 2 , wherein identifying one or more second text phrases combinable with the first text phrase according to the word combinability rules, comprises: identifying at most a specified number of second text phrases, wherein the at most specified number of second text phrases are selected as a set of phrases most likely to be selected by the first user to include in a chat message which includes the first text phrase and the second text phrase, and wherein the set of phrases most likely to be selected by the first are determined relative to predefined criteria.
5. The method of claim 3 , further comprising: receiving an indication of a selected one of the one or more second text phrases; combining the first text phrase and the second text phrase as a third text phrase; identifying one or more fourth text phrases combinable with the third text phrase according to the word combinability rules; and suggesting the one or more fourth text phrases to the first user.