153, of which three have posted on this thread so far 🙂
I'm a member of too many groups, but the groups do help in picking out photographers wirh some sort of common ground, be it technique, choice of camera, film, technology, or choice of subject material. Its helped me find a few talented people I have added to my contacts. And now and then some find me too. Flickr may not be ideal, but its not bad either.
As to if the number of contacts matter? No, not really. I use the view new material from contacts function to follow up on photographers I like, as such more is better than less. But at some point the number will become unmanageable. I'm not there yet.