I had over 2000 pages indexed from my chemistry help forum and then BAM, all unindexed , I made no changes and daily impression dropped to next to nothing. any ideas on what could have casued this?
Google is constantly changing their algorithm, when these changes occur your rankings will change and you may get more or less impressions.
thats nothing, one of my sites lost 16,000 pages lol - all out of no where but my traffic wasn't affected