LONDON (Reuters) - The amount of money spent on advertising on social media is set to catch up with newspaper ad revenues by 2020, a leading forecaster said on Monday.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=spxaNZK1kF4:OowdFMqY7Yo:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=spxaNZK1kF4:OowdFMqY7Yo:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=spxaNZK1kF4:OowdFMqY7Yo:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=spxaNZK1kF4:OowdFMqY7Yo:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=spxaNZK1kF4:OowdFMqY7Yo:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/spxaNZK1kF4" height="1" width="1" alt="" />