Social mentions - investigate possibility to move to Google/Bing search API

[tiblu]

Overview

Our Social Mentions feature currently only shows results from Twitter. It is so because FB, Twitter and other social platforms protect their data - no or very limited search by hashtag.
I looked into using Google search and found out that if you use the advanced search, we can compile a search that returns results from all major platforms. But we dropped the investigation as the price of Google Search API usage seemed a bit high at the time.

TODO

• Revive the reseach, see if we could get adequate results from Google/Bing search API searching by hashtag and maybe Topic title. Search result should cover Twitter and Facebook. Instagram is a bonus.
• Record the research outcome here - what was tried, what worked, what did not work etc.
• IF we find a way, implement it.

[ilmartyrk]

Closing as this is related to citizenos/citizenos-fe#776