Is the sentiment present in the input text negative?

Input: Fair warning to my 'non U2 followers' I will be tweeting and RT'ing heavily #U2Request between now and the end of Sep 1st. Mute if you want.
Fair warning to my 'non U2 followers' I will be tweeting and RT'ing heavily #U2Request between now and the end of Sep 1st. Mute if you want.