For me, this is a hard question to reply to.
I don't recognize too many differences in the friendships that I have; i search for the same types of people and act more or less the same around them. I find it easier to find people of a common mind on the internet, though I could be mistaken.
I have people that I feel close to and that I really enjoy online and in person. At times weeks pass without talking to one from either side, but we always seem to get along how we did before. Putting aside the differences created from the stipulations of each situation, i don't find any major differences personally.