I have about 20 sites about nutrition in various niches - for user experience I have interlinked them using only URL's. (also for some SEO gain because I didn't use nofollow :p )
It seems I have been hit by penguin, no bans - just lost traffic. Many sites are not at page 20 for several keywords.
I am thinking that the interlinking is the problem and decided to use a smaller threshold like interlinking 8 or 10 sites.
Anyone know a good safe threshold for crosslinking?
I have noticed a competitor of mine who is doing very well interlinking about 8 sites.