This may not be the actual Peter we know and love, however, he is listed by RTE colleagues and followed and #ff by other RTE colleagues
Update it seems it's not as @brendcole has confirmed. The real Peter Collins needs to get up and get this account dealt with quick - possibly by starting an authentic Twitter page - one way or another we need the real Peter Collins on Twitter.
In the mean time, this is causing a serious shitstorm on twitter at the moment.