[SEE UPDATES TO THIS POST AFTER THE PICTURE]
I’m posing this as a title because I haven’t done enough homework on this, but I’ve been getting some invites to Konnects lately, and I don’t ever see myself joining. Here’s one big reason: the site’s profile rankings are based on how many people you invite, which seems to be a cheap ploy to get people to spam others. From the Konnects site:

The
easiest way to increase visits to your profile is to invite and refer
your connections. Each time you invite or refer a connection you are
given a “referral point”. The member with the most points is always
displayed at the top of the page of their business category as the “top
networker”.
The more connections you have in your network the
better the chances of new opportunities coming your way. You could be
the most networked person in your city!
 

Those two paragraphs sum up so much of what’s wrong with it. First of all, it’s about the quality of a network, not the quantity of people in it that matters. Secondly, who really wants to be “top networker”? Show me a “top networker” at a party, and I’ll show you the guy I’m desperately trying to avoid.
Oh, and if I needed any other reasons to avoid the site, check out the stock photos they use. Wow, token black guy with scarily straight posture can befriend constipated white dude who uses hair gel to compensate for his receding hairline! Sweet!

 
UPDATE:
Kevin from Connects posted a comment with a different point of
view on this post, though I believe there are better ways to motivate
people than encouraging them to spam others.