What are the Maximum numbers of TAGs on wordpress, before you get banned by google?

On Wordpress blog, you can TAG your post with several keywords, right?
I tried to used ~100 TAGS for each wordpress post.

1) Is that excessive? If so, what are the Maximum numbers of TAGs we can use on wordpress, before you get banned by google?

The problem is, my latest 50 posts suddenly dissapeared from google SERP after using excessive TAGS. Have anyone also experience the same thing?
While my older blog posts (~200+ posts) are still being indexed by google, only the most recent ones (50+) suddenly disappeared. As a result, Now, when I create new blog post, it doesn't get indexed by google.

2) How can I get my disappeared 50+ blog posts being re-indexed again? Previously, these latest 50+ blog posts was shown on SERP, but suddenly missing 3 days ago. I had resubmit sitemap, ping my site using pingler, add URL to google, and still has no effect.

 

Google may have detected that your site have a lot of duplicated contents. IMO, it's not bad either. Every tag actually gives you backlinks.

 

You should not use that many tags, limit this to 5-10 tags per article and you should be ok. However this may not be a sole reason for de-indexing. A problem may be in excessive pinging as well. We had clients who were excessive with blog pinging and got their websites either 1.) de-ranked or 2.) de-indexed.

 

the number of inner links should be less than 100 per page. If you have 100 only in tags, go figure.

 

You should use relevant keywords to tag your post, otherwise Google would look you like a spamer.

 

If you put too many tags for each post, you are diluting the SEO credit for each post. Thats why your SERP ranking went down. I would not use more then 3 tags per post.