https://www.reuters.com/article/us-facebook-f8conference-dating/dating-sites-tinder-match-swoon-as-facebook-plays-the-field-idUSKBN1I244M >Investors sold off stock in dating sites, including Tinder and Match, on Tuesday on fears that Facebook Inc's creation of a dating service could lure users away due to the social network's larger membership, deep pockets and wealth of data.