The main output of the OpenCitations Project is the creation of the Open Citations Corpus (OCC), an open repository of scholarly citation data made available under a Creative Commons public domain dedication, which provides in RDF accurate citation information (bibliographic references) harvested from the scholarly literature. These are described using the SPAR Ontologies according to the OCC metadata model, and are made freely available so that others may freely build upon, enhance and reuse them for any purpose, without restriction under copyright or database law.
The OCC is being continuously populated from the scholarly literature.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20170712071208/https://support.twitter.com/articles/66884
After you protect your Tweets, only you and your followers can read your updates or see your Tweets in Twitter search.
If you at one time had public Tweets (before protecting your Tweets), those Tweets will no longer be public or appear in public Twitter search results. However, unprotecting your Tweets will cause any previously protected Tweets to be made public.
To find out how to remove your updates from Google search, check out this article. Twitter does not have the ability to remove content on websites other than twitter.com.
What If my Tweets have never been public?
If your Tweets have never been public (in other words, you've always had your Tweets protected in your settings), your updates should never show up in Twitter search or other public search engines.