poop.java

            try {
                packman.getPackageInfo("com.twitter.android", 0);
                builder.setNeutralButton(R.string.follow_koush, new OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // this is the intent you actually want.
                        // grabbed this by hooking a debugger up to twitter and debugging into android source.
                        Intent i = new Intent();
                        i.setClassName("com.twitter.android", "com.twitter.android.ProfileActivity");
                        i.putExtra("screen_name", "koush");
                        try {
                            startActivity(i);
                        }
                        catch (Exception ex) {
                            // uh something failed
                            ex.printStackTrace();
                        }
                    }
                });
            }
            catch (Exception ex) {
                // not installed
                ex.printStackTrace();
            }