Let me ask you the following questions & you let me know if you agree with the answers?
• Should your customer have to build a profile on a site where they have no common interest? No.
• Should you take time to build your profile on a site that your customers don't exist - just because it is popular? No.
• Should you find your customers first, then develop your profile on those particular sites? Yes.
This post is straight forward. The purpose of networking online is to connect with others of like business, like interest & like industry.
Don't waste your time doing something that isn't worth doing because you will be harder to find & connect to.