Wondering about search engine and DU..

For many years I've been a member here, altho I visit infrequently.
Always, when I want to visit, I put "dem..." in the search engine.
There's been no need to bookmark bec. usually as far as "dem..." in the search engine, this site comes up as a "suggestion."
Today, (with google) even putting in "Democratic underground", for 3 pages of results it did not come up. Finally I went to fb DU, and there found a link to the site.

This is pretty strange.
I know google, fb, et al, are doing a lot of messing around with various sites.
Has anybody heard of this happening, or any ideas what is going on?