Question: I am having difficulty aligning SNS buttons using CSS on this page giantmango.com/news. I am using the exact css and html, but I cannot align giantmango.com/news SNS buttons like the giantmango.com ones.

Answer: 
There are some cases when calling System.gc() is useful:

* You're going to run some benchmark, so you need to start in a well-defined state.
* You're expecting some heavy load and want to get prepared as good as possible.
* You have multiple servers and want to avoid pauses by scheduling GC on them periodically [like here](https://stackoverflow.com/q/36962630/581205).

There may be more use cases, however, it's nothing you could expect to need soon. Most of the time it's better to let it do its work its way.
What version of Java are we talking about here? In 6, I'd never call it explicitly. As a general rule of thumb the garbage collector is good enough to know when best to clean up resources and it's got enough configurable VM options. I've certainly never felt the need to call it in code, and I'd say unless you were doing something really bizarre (or showing resource usage) it's best not to. If you're feeling the need to call it then I'd say you've done something bad or wrong elsewhere.

If we're talking about working with Java 1.4 or before though, sometimes I find it does need a helping hand. No examples to hand (sorry) but I do remember needing to throw it a hint to avoid horrible lag when it decided to eventually kick in. With the same code on 6, the problem went away and calling it made little or no difference.

Of course, when you're calling `System.gc()` all you're actually doing is suggesting to the VM that now might be a good time to run the garbage collector. It doesn't mean it actually will, it's merely a suggestion that a perfectly valid VM implementation might entirely ignore. In fact there's even a DisableExplicitGC option that mean these calls **definitely won't** take affect (and lots of code in production environments is run with this option.)

So yes, it is still used in code - but the vast majority of the time it's not good practice at all.