Recently, Google has made an official announcement that as of April 21 2015, they will now use 'mobile compatibility' as a ranking signal. This is very important news as Google rarely informs the public what their ranking signals are. Furthermore, Google have said that after April 21, they will penalise sites that do not have a 'mobile compatibility' and users searching on mobile devices will no longer see these sites. Google have also said that they will award a boost in rankings to sites that do support mobile...