Google announced Accelerated Mobile Pages or AMP as a way to speed up loading results in search pages. This involved caching the most popular responses to common terms, preloading them in the background and then serving them instantly when you clicked on them on the search page. AMP'd links are highlighted in a separate section at the top in mobile search and always load instantly. However, due to the way it works, the AMP links have an altered URL which isn't very good for sharing purposes. Moreover, getting the original URL of the page was a bit of a hassle and not something most...
Source: http://www.gsmarena.com/google_makes_it_easier_to_share_original_url_in_amp_links-news-23246.php