A Ukip spokesman said that any breach of party rules would be investigated, but also criticised the exposure of candidate William Henwood's tweet by "the other parties."
A spokesman for the party told the BBC:
Any breach of our rules will be duly investigated and action will be taken.
However one has to question why the other parties are spending hours behaving like secret police and trawling through the social media of Ukip candidates who are everyday men and women, rather than actually doing politics.
Perhaps if they did they would be better able to tackle us on policy, rather than having to rely on smear campaigns to try to undermine Ukip's increasing popularity.
Were we to return the favour we would find an even greater wealth of embarrassment and disgrace in the other three parties' ranks to also spread across the media.
More top news
A sigh of relief across Westminster and a crushing sense of disappointment for 45% of Scotland, but Yes campaign could not have done more.
ITV Border Political Editor Peter MacMahon says we've just seen a emotional former SNP MSP appearing to concede that the Yes side has lost.
ITV Border Political Editor Peter MacMahon says it's far too early to call this referendum.