Could be useful but be careful. I've had profiles and pages banned by doing things like this.
I think the intelligence behind facebook (and twitter) is getting more sophisticated all the time and can recognise where likes are coming from. Abuses are being cracked down on.
I know it is tempting to use things like this, as I've done it in the past, but really natural is better and will produce better results and more profit long term. This isn't always what people want to hear in these days of instant fixes and get rich quick, but it is true.