Where to find meaningfull data for swing trading ?

Have a look at all the major news provided by Bloomberg and Reuters. They will sometime learn you interesting things and sometimes not. But you need to be aware of the latest financial news and these two companies will definitely help you for this.

One important thing is to consider all the news as clues that enable you to forecast market's direction. 

Finviz

This service is great for trading, especially for stock trading. There is a lot of important data on this website like charts, stock screeners, every data you need to know about a company, a news feed (news are coming from a large range of news agencies) and a very good feature which is the "Insider" category, where you can see every insider transations, made on the stock market (this is when a CEO or someone working in a listed company is going long or short on his company's stock. The SEC allow this activity only if the insider reports his position.)

Central Banks' websites

If you need to be updated about the latest economic realeses, then you should visit at least once a week the ECB and the FED's website to have real financial data. If you are reading the latest economic datas trough a third party website, then you will read someone else's opinion. But you are a trader, therefore you need to think by your own and to make yourself your own opinion. Central banks press realeases are long and sometimes hard to read but it is part of the job.
Our Filtered Reuters Business News

Visit Major News page and always be informed of big business news that may impact the markets. It will allow you to have a clear view into the huge muddle that data may represent.