Just wondering about this. Dd's 2.4 and is very chatty and sociable with adults but as far as other kids go she's either not that bothered (although does like talking about her playmates when they're not around) or she gets fed up with them if they interrupt her games / get too close. Generally other little kids seem more friendly towards her than she is towards them.
In your experience, what kind of age do toddlers generally open up to playing with others?