Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of China-based online media giant SINA (Nasdaq: SINA) got a bad connection today, falling as much as 13% on about double the average daily trading volume.

So what: SINA didn't do anything wrong, but Eastern Internet stocks are suffering across the board today. For example, Chinese video specialist Youku.com (Nasdaq: YOKU) fell as much as 11.6% and Rediff India (Nasdaq: REDF) dropped by 10.1%.

Now what: These irrational moves happen everywhere but are often magnified by the distance to Asian operations -- it's tough for an American investor to truly stay on top of what's happening half a world away, even in this Internet-shrunken world. On top of that, though hardly the reason for the entire rout, the Chinese renminbi has never been more expensive than it is today. But SINA and its industry have no news to share today. Simply put, nothing thesis-changing has happened to this longtime Stock Advisor recommendation recently -- even if the stock chart would have you believe otherwise. This could be a tremendous buy-in opportunity if you can handle some cross-border risk.

Interested in more info on SINA? Add it to your watchlist.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. Motley Fool newsletter services have recommended buying shares of SINA. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.