I came across a site yesterday... Swapes.com... which made me think that the next major wave of blog and forum spam is likely to be pushed by swapping of social citations by intermediate sites that are in themselves sort of social. Here's a quote from the Swapes homepage...
If you have an blog / forum, write about Swapes or worldsofting.com (include the link to our site) and we will give you one coupon code, depending of your blog / forum (age, traffic, etc), between 250 and 2500 coins. Your blog / forum need to have minimum 2 months old. If you write about Swapes or worldsofting.com on your forum, the topic need to be global. After you write about Swapes or worldsofting.com, send the link including your username to this email freecoupons@swapes.com and we will send you the coupon code.
Coins/coupon credits are good for Likes, +1s, etc. Just to be clear, I'm not in this game, and I suspect it will fail because of low reputation and self-control among the clickers... but it is more likely than many schemes I've seen to get around the location issues.