declaração de atividade múltipla do Android no manifesto

Eu tenho uma atividade principal. A partir disso, estou chamando duas outras sub-atividades chamadas FacebookLogin e Twitterlogin. Estou usando o seguinte código no AndroidManufest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.examples.Kikin" android:versionCode="1"
android:versionName="1.0">
<!-- THIS IS THE BEGINNING OF SHARING LINKS FROM THE BROWSER -->
<application android:icon="@drawable/kikinlogo"
    android:label="@string/app_name" android:debuggable="true">
    <activity android:name=".Kikin" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
        <intent-filter android:label="@string/app_name">
            <action android:name="android.intent.action.SEND" />
            <category android:name="android.intent.category.DEFAULT" />
            <data android:mimeType="text/plain" />
        </intent-filter>
    </activity>
    <activity android:name=".FacebookLogin" android:label="@string/app_name">
        <intent-filter android:label="@string/app_name">
            <action android:name="android.intent.action.SEND" />
            <category android:name="android.intent.category.DEFAULT" />
        <!--    <data android:mimeType="image/png" /> -->
        </intent-filter>
    </activity>
    <activity android:name=".TwitterLogin" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.VIEW"></action>
            <category android:name="android.intent.category.DEFAULT"></category>
            <category android:name="android.intent.category.BROWSABLE"></category>
            <data android:scheme="yourapp" android:host="twitt"></data>
        </intent-filter>
    </activity>

</application>
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />

Eu estou fazendo a coisa certa? Devo aninhar as atividades do FacebookLogin e TwitterLogin nas principais atividade? As 2 classes acima mencionadas estão no pacote com.examples.. * é o mesmo sempre que usado.

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