Social networking is an absolute necessity in today's world of commerce. Making connections, offering help and solutions, making a name for yourself is vital. There are now hundreds of networking groups available and more being created daily. Which ones are you involved with? Is there any point in joining more but not participating?
There is an old saying, "you only get out of something what you put into it." This applies to joining groups, whether social or digital networking, or a Chamber of Commerce. Joining alone results in nothing - joining and taking an active role greatly increases your chances of receiving - give in order to receive.
The question is - how many organizations or groups can you be active in at one time and still  maintain balance in the rest of your life?