Edit: Even though it claims the explosion was at about 13:30, ESA was still tweeting about success at 14:00. Seems pretty clear this is a hoax, or blogspam, or similar.
Edit: Thanks for your link but it just points back to this same page, it's not supporting evidence.
Edit: The alleged "More information" from the same Twitter account is simply a link to what is clearly a computer generated image of a launch. Not credible.
This appears to be a traffic generating scam/hoax.
Edit: Nothing on the ESA twitter feed: https://mobile.twitter.com/esa
Edit: Even though it claims the explosion was at about 13:30, ESA was still tweeting about success at 14:00. Seems pretty clear this is a hoax, or blogspam, or similar.