To match feature: INTERNET-SOCIALMEDIA/PRIVACYTEL AVIV (Reuters) – Facebook has agreed to buy start-up app-maker Onavo, the Israeli company mentioned on its website online on Monday, without giving any small print of the deal. Facebook is paying between $a hundred and fifty million and $200 million, the Calcalist financial news website mentioned, making it the social media firm's biggest acquisition in Israel. The corporate, based three years in the past, mentioned that when the transaction closes, Onavo's mobile utility utility – which helps individuals lower mobile phone costs via more efficient use of knowledge – will run as a standalone model. …