34. The system of claim 20 , wherein the contextual speller model comprises a plurality of speller sub-models.
34. The system of claim 20 , wherein the contextual speller model comprises a plurality of speller sub-models. 37. The system of claim 34 , wherein the plurality of speller sub-models are based at least on one or more levels of aggregation, and wherein each level of aggregation differentiates the first user from global users of the online social network.