15. The method of claim 1 , wherein the contextual speller model comprises a plurality of speller sub-models.
15. The method of claim 1 , wherein the contextual speller model comprises a plurality of speller sub-models. 18. The method of claim 15 , 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.